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Definition of Tristan chord
1. Noun. (music) A chord in musical composition consisting originally of the notes F, B, D# and G# which can be translated more generally in intervalic terms as: augmented fourth, augmented sixth and augmented ninth above a root. Enharmonically it sounds like a half-diminished seventh chord (e.g. F-A?-C?-E?), though in terms of musical analysis it can be interpreted in several ways. ¹
¹ Source: wiktionary.com